Description
KTP crystal
Nonlinear optical crystal KTiOPO4 (KTP) has excellent frequency doubling performance: large nonlinear coefficient, no delixation, optical damage threshold up to GW/cm2, and little change of phase matching condition with temperature. According to practical experience, crystals with large nonlinear coefficients often have excellent electro-optical properties. The successful development of low conductivity KTP crystal by molten salt method has greatly promoted the practical application of KTP electro-optic devices, especially in the field of high-frequency modulation.
KTP Electro-optical Q-switch Crystal—a crystal having a high electrooptic coefficient, a low dielectric constant, and capable of operating at high frequencies
The dielectric constant ε22 of KTP varies little with frequency and is not affected by the electric coupling effect under pressure. ε33 varies greatly with frequency and is not affected by the electrical coupling effect under pressure. Especially at high frequencies, ε22 and ε33 do not vary with frequency.Outside the 500kHz-10MHz region, electro-optic devices made with KTP crystals do not produce parasitic oscillations due to piezoelectric coupling, which are severe in other electro-optic crystals. The thermal hysteresis effect of KTP is much smaller and has high temperature stability.
Physical and Optical Properties
Transparency range
350-4500 nm
Crystal structure
Orthorhombic
Density
3.01 g/cm3
Mohs hardness
5
Absorption Coeffient
a < 1%/cm @1064 nm and 532 nm
Refractive indices
nx=1.7377, ny=1.7453, nz=1.8297 @ 1064 nm
nx=1.7780, ny=1.7886, nz=1.8887 @ 532 nm
Sellmeier equations (λ, μm)
nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2
ny2=3.0333+0.04154/(λ2-0.04547)-0.01408λ2
nz2=3.3134+0.05694/(λ2-0.05658)-0.01682λ2
Thermal conductivity
13 W/m/K
Therm-optic Coefficients (/℃)
dnx/dT=1.1*10-5
dny/dT=1.3*10-5
dnz/dT=1.6*10-5
Electro-Optic Properties
Electro-optic coefficients
Low Frequency (pm/V)
High Frequency (pm/V)
r13
9.5
8.8
r23
15.7
13.8
r33
36.3
35
r51
7.3
6.9
r42
9.3
8.8
Phase Matching Range
980-3400 nm
Flatness
Less than λ/8 @ 633 nm
Wave front distortion
Less than λ/8 @ 633 nm
Transmission surface parallelism
Less than 20″
Electrical conductivity
3.5*10-8 s/cm (c-axis,22℃,1KHz)
